Code Beautifier
Format supported source code online with readable indentation while reviewing syntax, comments, and output limits.
Make HTML structure easier to inspect
This tool reformats supported source code with line breaks, spaces, and indentation to make it easier to read. Beautification is a presentation transformation. It does not validate, execute, optimize, or prove that the source is safe or correct.
Formatting is not HTML validation
A code beautifier reads structure such as blocks, lists, declarations, strings, and comments, then emits a consistent layout. Language grammars and style options determine where lines break and how nested content is indented. Generic formatting may misread unsupported syntax.
How to format HTML
- Choose the language, paste source, select style options, run the formatter, and compare the result with the original. Review strings, comments, regular expressions, embedded code, and source maps. Use a project formatter for repeatable builds.
- Choose the language, paste source, select style options, run the formatter, and compare the result with the original. Review strings, comments, regular expressions, embedded code, and source maps. Use a project formatter for repeatable builds. Compare formatted output with the source before committing.
Formatting method
- Read markup structure
The beautifier tokenizes or parses source, tracks nesting and protected regions, and emits formatted text. It aims to preserve tokens and order while changing whitespace. Parser versions, dialects, comments, and embedded languages can affect the output.
- Apply indentation
The beautifier tokenizes or parses source, tracks nesting and protected regions, and emits formatted text. It aims to preserve tokens and order while changing whitespace. Parser versions, dialects, comments, and embedded languages can affect the output.
- Preserve content
The beautifier tokenizes or parses source, tracks nesting and protected regions, and emits formatted text. It aims to preserve tokens and order while changing whitespace. Parser versions, dialects, comments, and embedded languages can affect the output.
Exact parser recovery, optional-tag handling, whitespace policy, embedded-language behavior, and error wording should be c...
Read the formatted result
A useful result has stable indentation, readable blocks, intact strings and comments, and no unexpected token changes. Formatting does not prove syntax validity or semantic equivalence. Run the project parser, linter, tests, and build when needed.
Common mistakes
Common mistakes include formatting the wrong language, altering whitespace-sensitive data, losing license comments, treating output as validation, and committing a large unrelated diff without reviewing it.
Common mistakes include formatting the wrong language, altering whitespace-sensitive data, losing license comments, treating output as validation, and committing a large unrelated diff without reviewing it. Compare formatted output with the source before committing.
Limits and special cases
The beautifier cannot recover author intent, support every dialect, guarantee style parity with a project, or preserve behavior when syntax is unsupported. Pin configuration and inspect the diff.
The beautifier cannot recover author intent, support every dialect, guarantee style parity with a project, or preserve behavior when syntax is unsupported. Pin configuration and inspect the diff. Compare formatted output with the source before committing.
Examples
Code Beautifier online — 1
What does a code beautifier do?
Choose the language, paste source, select style options, run the formatter, and compare the result with the original. Review strings, comments, regular expressions, embedded code, and source maps. Use a project formatter for repeatable builds.
A useful result has stable indentation, readable blocks, intact strings and comments, and no unexpected token changes. Formatting does not prove syntax validity or semantic equivalence. Run the project parser, linter, tests, and build when needed.
Code Beautifier online — 2
Does it validate code?
Choose the language, paste source, select style options, run the formatter, and compare the result with the original. Review strings, comments, regular expressions, embedded code, and source maps. Use a project formatter for repeatable builds.
A useful result has stable indentation, readable blocks, intact strings and comments, and no unexpected token changes. Formatting does not prove syntax validity or semantic equivalence. Run the project parser, linter, tests, and build when needed.
Code Beautifier online — 3
Can it change behavior?
Choose the language, paste source, select style options, run the formatter, and compare the result with the original. Review strings, comments, regular expressions, embedded code, and source maps. Use a project formatter for repeatable builds.
A useful result has stable indentation, readable blocks, intact strings and comments, and no unexpected token changes. Formatting does not prove syntax validity or semantic equivalence. Run the project parser, linter, tests, and build when needed.
Code Beautifier online — 4
Are comments preserved?
Choose the language, paste source, select style options, run the formatter, and compare the result with the original. Review strings, comments, regular expressions, embedded code, and source maps. Use a project formatter for repeatable builds.
A useful result has stable indentation, readable blocks, intact strings and comments, and no unexpected token changes. Formatting does not prove syntax validity or semantic equivalence. Run the project parser, linter, tests, and build when needed.
Code Beautifier online — 5
Does it support every language?
Choose the language, paste source, select style options, run the formatter, and compare the result with the original. Review strings, comments, regular expressions, embedded code, and source maps. Use a project formatter for repeatable builds.
A useful result has stable indentation, readable blocks, intact strings and comments, and no unexpected token changes. Formatting does not prove syntax validity or semantic equivalence. Run the project parser, linter, tests, and build when needed.
Code Beautifier online — 6
Why did line breaks change?
Choose the language, paste source, select style options, run the formatter, and compare the result with the original. Review strings, comments, regular expressions, embedded code, and source maps. Use a project formatter for repeatable builds.
A useful result has stable indentation, readable blocks, intact strings and comments, and no unexpected token changes. Formatting does not prove syntax validity or semantic equivalence. Run the project parser, linter, tests, and build when needed.
Frequently asked questions
What does a code beautifier do?
Beautification changes layout for readability. Confirm syntax, semantics, style configuration, and tests with the project toolchain.
Does it validate code?
Beautification changes layout for readability. Confirm syntax, semantics, style configuration, and tests with the project toolchain.
Can it change behavior?
Beautification changes layout for readability. Confirm syntax, semantics, style configuration, and tests with the project toolchain.
Are comments preserved?
Beautification changes layout for readability. Confirm syntax, semantics, style configuration, and tests with the project toolchain.
Does it support every language?
Beautification changes layout for readability. Confirm syntax, semantics, style configuration, and tests with the project toolchain.
Why did line breaks change?
Beautification changes layout for readability. Confirm syntax, semantics, style configuration, and tests with the project toolchain.
Should I use it in a build?
Beautification changes layout for readability. Confirm syntax, semantics, style configuration, and tests with the project toolchain.
How do I verify output?
Beautification changes layout for readability. Confirm syntax, semantics, style configuration, and tests with the project toolchain.